Workshop summary: Expert witnesses play an integral role in the legal system.  Experts are people with specialized skill sets whose opinion may help a judge or jury make sense of factual evidence in a case.  Testimony from expert witnesses can have a tremendous influence on the final decision of the judge.  Statisticians have a natural role as expert witnesses, both in conducting and presenting data analyses, in interpreting and providing opinions on data and studies, and in providing opinions on the statistical methods used by other experts.  I will describe the role of the expert in the court system and discuss specific examples and case studies where statisticians have contributed to the legal process.  Through working sessions we will role-play as experts and review statisticians’ reports in high-profile cases.